Al-Kāfi - Volume 6 > Mixed Dish
Hadith #3

أَحْمَدُ بْنُ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنْ زِيَادِ بْنِ أَبِي الْحَلَّالِ قَالَ تَعَشَّيْتُ مَعَ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) بِلَحْمٍ بِلَبَنٍ فَقَالَ هَذَا مَرَقُ الْأَنْبِيَاءِ ( عليهم السلام ) .

3. Ahmad ibn Muhammad from Muhammad ibn Sinan from Ziyad ibn abu al-Halfal who has said the following: “I once had dinner with abu ‘Abd Allah, ‘Alayhi al-Salam, and it was meat with milk. He (the Imam) said, ‘It is the sauce of the Prophets, ‘Alayhim al-Salam.’”